... speed: 5-35rpm.c).screw feeder: 4kw motor frequency conversion speed adjusting.d).accumulator pre-pressurization: 5Mpae).allowable max. ... fixed amount transportation, 0.75kw power, 4L/rpm, frequency conversion speed adjustment.2) Screw feeder: Composed of charger with ... 4kw frequency conversion speed adjusting motor, taper helix, agitator knife, taper charger ...